package com.atguigu.educenter.controller;


import com.atguigu.commonutils.JwtUtils;
import com.atguigu.educenter.entity.UcenterMember;
import com.atguigu.educenter.service.UcenterMemberService;
import com.atguigu.educenter.utils.ConstantWxUtil;
import com.atguigu.educenter.utils.HttpClientUtils;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.net.URLEncoder;
import java.util.HashMap;

//@CrossOrigin
//@RestController两个作用：1创建对象，交给spring管理 2通过response返回数据    现在不需要数据返回，所以换Controller
@Controller
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    //2.获取扫描人信息，添加数据
    @GetMapping("callback")
    public String callback(String code,String state){
        try {
            System.out.println("执行跳转");
            //-----------------------------------------------------------------------------------------
            //第一步：获取code值（临时票据，类似验证码）
            //第二步：拿着code请求微信固定地址，得到两个值 accsess_token 和 openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接三个参数：id 密钥 和 code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtil.WX_OPEN_APP_ID,
                    ConstantWxUtil.WX_OPEN_APP_SECRET,
                    code
            );
            //请求这个拼接好的地址，得到返回两个值 accsess_token 和 openid
            //使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);
            //把accessTokenInfo字符串转换map集合，根据map里面key获取对应值
            //使用json转换工具Gson
            Gson gson=new Gson();
            //转换为map集合
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo,HashMap.class);
            //根据map集合取出值
            String access_token = (String)mapAccessToken.get("access_token");
            String openid = (String)mapAccessToken.get("openid");

            //-----------------------------------------------------------------------------------------
            //将扫码人信息添加进数据库
            //判断数据库表里面是否存在相同微信信息
            UcenterMember member = memberService.getOpenIdMember(openid);
            if (member == null)  //如果member是空，则添加
            {
                //-----------------------------------------------------------------------------------------
                //第三步：拿着得到accsess token和openid,再去请求微信提供固定的地址，获取到扫描人信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";

                //拼接两个参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //获取返回userInfo字符串扫描人信息
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String) userInfoMap.get("nickname");       //昵称
                String headimgurl = (String) userInfoMap.get("headimgurl");   //头像链接
                //-----------------------------------------------------------------------------------------
                //往数据库添加值
                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }
            //-----------------------------------------------------------------------------------------
            //使用jwt根据member对象生成token字符串
            //两个参数：id和昵称
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
            //最后：返回首页面，通过路径传递token字符串
            return "redirect:http://localhost:3000?token="+jwtToken;
        }catch (Exception e){
            throw new GuliException(20001,"登录失败");
        }
    }


    //1生成微信扫描二维码
    @GetMapping("login")
    public String getWxCode(){
        //请求微信地址

        //固定地址，后面拼接参数
        //1.老方法拼接：
//        String url = "https://open.weixin.qq.com/"+
//              "connect/grconnect?appid="+ ConstantWxUtil.WX_OPEN_APP_ID+"&response_type=code";
        //2.新方法拼接

        // 微信开放平台授权baseUrl            %s相当于？,代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行urlEncode编码
        String redirectUrl = ConstantWxUtil.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "utf-8");
        }catch (Exception e){

        }

        //设置%s里面的值
        String url = String.format(
                baseUrl,
                ConstantWxUtil.WX_OPEN_APP_ID,
                ConstantWxUtil.WX_OPEN_REDIRECT_URL,
                redirectUrl,
                "atguigu"

        );
        //redirect为ssm阶段中的重定向，重定向到该地址
        return "redirect:"+url;
    }
}
